2Rogers C A.Packing and Covering[C].Cambridge:Cambridge University Press,1964.
3Wathrick C A,Stucki P.An Algorithmic Comparison Between Square and Hexagonal-Based Grids[J].CVGIP:Graphical Models and Images Processing,1991,53 (4):324-339.
4Bell S M.Holroyd F C,Mason D C.A digital geometry for hexagonal pixels[J].Image and Vision Computing,1989,7 (3):194-204.
5Liu Yong-Kui.The Generation of Straight Lines on Hexagonal Grids[J].Computer Graphics Forum,1993,12(1):27-31
6Liu Yong-Kui.The Generation of Circular Lines on Hexagonal Grids[J].Computer Graphics Forum,1993,12(1):21-26.
7Garliauskas A.The Visual cortex modeling by the hexagonal topology[J].Neurocomputing,2001,38 (6):1229-1238.
8Middleton L,Sivas Wamy J.Edge detection in a hexagonal image processing framework[J].Image and Vision computing,2001,19(14):1071-1081.